Radiological and clinical outcomes of balloon kyphoplasty for osteoporotic vertebral compression fracture in patients with rheumatoid arthritis

Table 5 Clinical features, outcomes, and complications of KP between groups of normal and elevated CRP

Variable		Normal CRP	Elevated CRP	P value
Patients/vertebrae		26/41	72/117
Age (year)		73.0	70.7	0.298
Gender (male to female)		2:24	6:66	0.999
Time to surgery		22.0	20.6	0.107
BMD (g/cm²)		0.53	0.54	0.912
ESR (mm/h)		31.0	37.6	0.114
CRP (mg/dL)		1.65	14.05	< 0.01
Glucocorticoid users		20	45	0.230
Cement leakage (vertebra)		11 (26.8%)	32 (27.3%)	0.947
Refracture		1	2	0.999
Adjacent vertebral fracture		4	14	0.999
Radiological outcomes
Compression rate (%)	Preop	62.28%	58.89%	0.450
Compression rate (%)	1 year FU	73.21%	70.66%	0.281
Local kyphotic angel (°)	Preop	7.95	7.94	0.692
Local kyphotic angel (°)	1 year FU	4.25	4.14	0.074
Clinical outcomes
VAS	Preop	8.05	8.13	0.563
VAS	1 year FU	2.27	2.35	0.585
ODI	Preop	80.16	81.47	0.412
ODI	1 year FU	27.02	27.41	0.493

Values are given as mean ± SD. ESR indicates erythrocyte sedimentation rate, CRP indicates c-reactive protein, BMD indicates bone mineral density, and Refracture indicates the operated vertebral body refractured again after KP. Preop indicates preoperation, FU indicates follow-up, VAS indicates visual analog scale, and ODI indicates Oswestry disability index

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